Question

我正在借助Universal Image loader库构建应用程序。我的主要活动从一些网址加载图片并在gridview中显示。我想在单独的活动中显示完整的图像。当我点击任何图像在新活动中打开它时，我的应用程序崩溃了。

我无法理解UIL给出的示例代码，它很冗长。所以，我想只进行网格视图活动。

这是我的代码：

ImageListAdapter.java

 public class ImageListAdapter extends BaseAdapter {

    public String[] urls = {

            "https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s1024/A%252520Photographer.jpg",
            "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s1024/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg",
            "https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s1024/Another%252520Rockaway%252520Sunset.jpg",
            "https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s1024/Antelope%252520Butte.jpg",
            "https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s1024/Antelope%252520Hallway.jpg",
            "https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s1024/Antelope%252520Walls.jpg",
            "https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s1024/Apre%2525CC%252580s%252520la%252520Pluie.jpg",
            "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s1024/Backlit%252520Cloud.jpg",
            "https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s1024/Bee%252520and%252520Flower.jpg",
            "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s1024/Bonzai%252520Rock%252520Sunset.jpg",
            "https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s1024/Caterpillar.jpg",
            "https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s1024/Chess.jpg",

    };

    private Context context;
    private ImageLoader imageLoader;

    public ImageListAdapter(Context context) {
        this.context = context;
        imageLoader = ImageLoader.getInstance();
    }

    @Override
    public int getCount() {
        return urls.length;
    }

    @Override
    public Object getItem(int arg0) {
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        View v = convertView;

        ViewHolder vh = null;
        if (v == null) {
            v = View.inflate(context, R.layout.single_item, null);

            vh = new ViewHolder();
            vh.imageView = (ImageView) v.findViewById(R.id.imageView);

            v.setTag(vh);
        }
        else {
            vh = (ViewHolder)v.getTag();
        }

        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .cacheOnDisc()
                .build();

        imageLoader.displayImage(urls[position], vh.imageView, options);

        return v;
    }

    private class ViewHolder {
        ImageView imageView;
    }

}

MainActivity.java（此处图片显示在GridView中）

public class MainActivity extends ActionBarActivity {

    private ListView listView;
    private GridView gridView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.grid_layout);

       // listView = (ListView)findViewById(R.id.gridView);
        gridView = (GridView) findViewById(R.id.gridView);
        gridView.setAdapter(new ImageListAdapter(this));



        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
               i.putExtra("id", position);
               startActivity(i);

            }
        });

    }

}

FullImageActivity.java

public class FullImageActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_full_image);

        Intent i = getIntent();
        int position = i.getExtras().getInt("id");
        ImageListAdapter imageAdapter = new ImageListAdapter(this);
        ImageView imageView = (ImageView)
                findViewById(R.id.full_image_view);
        imageView.setImageResource(Integer.parseInt(imageAdapter.urls[position]));
    }

}

当我运行android studio时错误没有显示。请帮忙。

Answer 1

您是否已将新活动添加到清单文件中？

添加此

<activity
    android:name=".FullImageActivity "
    android:label="FullImageActivity " />

Answer 2

您不需要使用getextras（）

重新修改此行

Intent i = getIntent();
int position = i.getExtras().getInt("id");

到

Intent i = getIntent();
int position = i.getIntExtra("id",-1);

编辑：您正在尝试从互联网上加载图片，您无法直接使用图片资源。

URL ulrn = new URL(url);
HttpURLConnection con = (HttpURLConnection) ulrn.openConnection();
InputStream iS = con.getInputStream();
Bitmap bmp = BitmapFactory.decodeStream(iS);
image.setImageBitmap(bmp);

Answer 3

你的问题是，

您的FullImageActivity活动找不到imageView的图片资源

从这一行开始，

imageView.setImageResource(Integer.parseInt(imageAdapter.urls[position]));

您正在尝试在整数中转换字符串图片网址，因此可能是您面临的数字格式例外。

只需从给定的图片网址加载位图，然后尝试将位图设置为ImageView ..

仅用于理解的伪代码：

Bitmap imageBitmap = loadBitmapFormUrl(imageAdapter.urls[position]); // Your method which load image bitmap from given url (please use asynchronously)
imageView.setImageBitmap(imageBitmap); // After receiving image bitmap set it to imageView

在项目中单击gridview我的下一个活动未显示

3 个答案: